Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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æqualitatis. </
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<
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>Attractiones igitur, in contrarias partes æqualiter fac
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tæ, ſe mutuo deſtruunt. </
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<
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>Et ſimili argumento, attractiones omnes
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per totam Sphæricam ſuperficiem a contrariis attractionibus de
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ſtruuntur. </
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<
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>Proinde corpus
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P
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nullam in partem his attractionibus
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impellitur.
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Q.E.D.
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DE MOTU
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CORPORUM</
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PROPOSITIO LXXI. THEOREMA XXXI.
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Iiſdem poſitis, dico quod corpuſculum extra Sphæricam ſuperficiem
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conſtitutum attrahitur ad centrum Sphæræ, vi reciproce propor
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tionali quadrato diſtantiæ ſuæ ab eodem centro.
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<
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>Sint
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AHKB, ahkb
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æquales duæ ſuperficies Sphæricæ, centris
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S, s,
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diametris
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AB, ab
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deſcriptæ, &
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P, p
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corpuſcula ſita extrin
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ſecus in diametris illis productis. </
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>Agantur a corpuſculis lineæ
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PHK, PIL, phk, pil,
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auferentes a circulis maximis
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AHB,
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ahb,
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æquales arcus
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HK, hk
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&
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IL, il:
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Et ad eas de
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mittantur perpendicula
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SD, sd; SE, se; IR, ir;
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quorum
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SD, sd
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ſecent
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PL, pl
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in
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F
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&
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f:
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Demittantur etiam ad diame
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tros perpendicula
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IQ,
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Evaneſcant anguli
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DPE, dpe:
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&
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(ob æquales
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DS
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&
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ds, ES
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&
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es,
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) lineæ
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PE, PF
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&
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pe, pf
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& lineolæ
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DF, df
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pro æqualibus habeantur; quippe quarum ra
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tio ultima, angulis illis
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DPE, dpe
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ſimul evaneſcentibus, eſt æ
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qualitatis. </
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<
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>His itaque conſtitutis, erit
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PI
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ad
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PF
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ut
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RI
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ad
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DF,
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&
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pf
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ad
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pi
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ut
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df
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vel
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DF
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ad
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ri
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; & ex æquo
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PIXpf
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ad
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PFXpi
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ut
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RI
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ad
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ri,
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hoc eſt (per Corol. </
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>3. Lem. </
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>VII,) ut arcus
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IH
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ad
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arcum
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ih.
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Rurſus
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PI
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ad
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PS
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ut
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IQ
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ad
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SE,
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&
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ps
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and
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pi
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ut
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se
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vel
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SE
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ad
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<
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& ex æquo
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PIXps
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ad
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PSXpi
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ut
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IQ
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ad
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ET
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conjunctis rationibus
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PI quad.XpfXps
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ad
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pi quad.XPFXPS,
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ut
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IHXIQ
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ad
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<
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hoc eſt, ut ſuperficies circularis, quam </
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